JP5708931B2 - Electromagnetic shielding gasket - Google Patents

Electromagnetic shielding gasket Download PDF

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JP5708931B2
JP5708931B2 JP2011151643A JP2011151643A JP5708931B2 JP 5708931 B2 JP5708931 B2 JP 5708931B2 JP 2011151643 A JP2011151643 A JP 2011151643A JP 2011151643 A JP2011151643 A JP 2011151643A JP 5708931 B2 JP5708931 B2 JP 5708931B2
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conductive member
substrate
conductive
gasket
edge
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JP2013021049A (en
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真哉 中岡
真哉 中岡
尚紀 田渕
尚紀 田渕
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Nok Corp
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Description

本発明は電磁波シールドガスケットに係り、詳しくは、導電性部材の間隙に介在されて流体の漏れや異物の侵入を防止するガスケットにおいて、前記間隙を通過しようとする電磁波ノイズを遮蔽する機能を与えたものに関する。   The present invention relates to an electromagnetic wave shielding gasket, and more particularly, in a gasket that is interposed in a gap between conductive members to prevent fluid leakage and foreign matter from entering, the function of shielding electromagnetic wave noise that attempts to pass through the gap is provided. About things.

従来から、例えば図3に示すように、内燃機関のシリンダヘッドとシリンダブロック、あるいはシリンダブロックとオイルパンなど、互いに結合される第一部材110と第二部材120の間に気密性の維持のために介装されるガスケット100は、弾性変形可能な金属製の基板101の両面を、ゴム状弾性材料(ゴム材料又はゴム状弾性を有する合成樹脂材料)からなる弾性膜102,103でコーティングしたメタル・ラバー複合材料からなるものが使用されている。   Conventionally, for example, as shown in FIG. 3, a cylinder head and a cylinder block of an internal combustion engine, or a cylinder block and an oil pan, etc. are used to maintain airtightness between the first member 110 and the second member 120 that are coupled to each other. The gasket 100 interposed between the two is coated with elastic films 102 and 103 made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) on both sides of an elastically deformable metal substrate 101.・ Uses made of rubber composite material.

この種のガスケット100は、塑性加工によって厚さ方向両側へ交互に突出形成された、連続した複数のシールビード100a〜100dを有し、このシールビード100a〜100dが弾性膜102,103で第一部材110と第二部材120に密接されることによって、密封機能を発揮するものである(例えば下記の特許文献1,2参照)。   This type of gasket 100 has a plurality of continuous seal beads 100a to 100d that are alternately formed on both sides in the thickness direction by plastic working, and the seal beads 100a to 100d are elastic films 102 and 103, and are first films. By being in close contact with the member 110 and the second member 120, a sealing function is exhibited (for example, see Patent Documents 1 and 2 below).

ところで近年は、ハイブリッド自動車や電気自動車の普及に伴い、自動車には多くの電子機器や電気機器が搭載されているが、この電子機器等から発生する電磁波ノイズEMI(electro-magnetic interference)の放射強度が大きい場合は、周囲の機器の電子回路の破壊や誤動作などの悪影響を及ぼすおそれがあるので、電子機器等のケーシングに用いられるガスケットには、ダストや水等に対する密封性に加えて、良好な電磁波シールド性が求められる。   By the way, in recent years, with the spread of hybrid vehicles and electric vehicles, many electronic devices and electric devices are mounted on the vehicles, but the radiation intensity of electromagnetic noise EMI (electro-magnetic interference) generated from these electronic devices. Is large, there is a risk of adverse effects such as the destruction or malfunction of the electronic circuits of the surrounding equipment. For gaskets used for casings of electronic equipment, in addition to sealing properties against dust, water, etc., good Electromagnetic shielding properties are required.

しかしながら、図3に示すようなガスケット100では、例えば第一部材110が電子機器を収納する筐体、第二部材120がこの第一部材110の開口部を塞ぐように結合される蓋体である場合、第一部材110と第二部材120及びガスケット100の基板101が導電性を有する金属からなるものであっても、シールビード100a〜100dは、第一部材110と第二部材120に対して電気絶縁性の弾性膜102,103で密接しており、すなわちシールビード100a〜100dでは、第一部材110と第二部材120と基板101の間に、内部空間Sに収納された電子機器から発生する電磁波ノイズEMIの透過を許容する弾性膜102,103による電磁的隙間が存在しており、このため電磁波シールド性に乏しいものであった。   However, in the gasket 100 as shown in FIG. 3, for example, the first member 110 is a casing that houses an electronic device, and the second member 120 is a lid that is coupled so as to close the opening of the first member 110. In this case, even if the first member 110, the second member 120, and the substrate 101 of the gasket 100 are made of a conductive metal, the seal beads 100 a to 100 d are in relation to the first member 110 and the second member 120. Electrically insulating elastic films 102 and 103 are in close contact, that is, the seal beads 100a to 100d are generated from an electronic device housed in the internal space S between the first member 110, the second member 120, and the substrate 101. Electromagnetic gaps due to the elastic films 102 and 103 that allow the transmission of electromagnetic wave noise EMI are present, and therefore the electromagnetic wave shielding property is poor. It was.

またこの種のメタル・ラバー複合材料からなるガスケットにおいて、下記の特許文献3のように、ダストや水等に対するシール部にのみ弾性膜を形成し、他の部分では導電性金属からなる基板を、導電性金属からなる相手部材に金属接触させて電気的に導通させることによって電磁波シールド性を確保したものがあるが、弾性膜の接触によるシール部と基板の金属接触による電磁波シールド部の双方を形成する必要があるため、ガスケットの幅が広くなってしまうことは避けられず、しかも、螺子などの締結力による厚さ方向の圧縮反力も大きくなってしまうといった問題があった。   Further, in a gasket made of this type of metal rubber composite material, as in Patent Document 3 below, an elastic film is formed only on a seal portion against dust, water, etc., and a substrate made of a conductive metal in other portions, Although there are those that have secured electromagnetic wave shielding properties by making metal contact with a mating member made of conductive metal and making it electrically conductive, both a seal part due to contact with the elastic film and an electromagnetic wave shield part due to metal contact with the substrate are formed Therefore, it is inevitable that the width of the gasket becomes wide, and there is also a problem that the compression reaction force in the thickness direction due to the fastening force of a screw or the like becomes large.

特開2008−223952号公報JP 2008-223952 A 特開2005−290359号公報JP 2005-290359 A 特開平11−274783号公報JP-A-11-274783

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題は、メタル・ラバー複合材料からなるガスケットにおいて、ガスケットの幅の増大や圧縮反力の増大を来たすことなく電磁波シールド性を与えることにある。   The present invention has been made in view of the above points, and its technical problem is that a gasket made of a metal-rubber composite material does not increase the width of the gasket or increase the compression reaction force. It is to provide electromagnetic shielding properties.

上述した技術的課題を有効に解決するための手段として、本発明に係る電磁波シールドガスケットは、一対の導電性部材間に介在されるガスケットであって、導電性金属からなる基板の厚さ方向両面に、それぞれゴム状弾性材料からなり前記導電性部材の対向面と密接可能な弾性膜が被着された構造を備え、前記基板の外縁部が一方の導電性部材側へ屈曲されてこの一方の導電性部材の外側面に沿って延びる外側遮蔽縁と、前記基板の内縁部が他方の導電性部材側へ屈曲されてこの他方の導電性部材の内側面に沿って延びる内側遮蔽縁を有するものである。   As a means for effectively solving the technical problem described above, an electromagnetic wave shielding gasket according to the present invention is a gasket interposed between a pair of conductive members, and both sides in the thickness direction of a substrate made of a conductive metal. Each of which is made of a rubber-like elastic material and has a structure in which an elastic film capable of being in close contact with the opposing surface of the conductive member is attached, and the outer edge portion of the substrate is bent toward one of the conductive members. An outer shielding edge extending along the outer surface of the conductive member, and an inner shielding edge in which the inner edge portion of the substrate is bent toward the other conductive member side and extends along the inner surface of the other conductive member It is.

上記構成において、ゴム状弾性材料からなる弾性膜は、導電性部材の対向面と密接されることによって、ダストや水等に対する密封性を奏するものであり、基板は弾性変形によってその反力で前記導電性部材に対する弾性膜の密接力を与えるものであると共に、導電性金属からなることによって電磁波ノイズの透過を遮蔽するものである。また、外側遮蔽縁及び内側遮蔽縁は、導電性部材と基板の間に介在する電気絶縁性の弾性膜による電磁的隙間をその外側及び内側から覆うように延びる前記基板の一部によって、前記電磁的隙間を透過しようとする電磁波ノイズ又は前記電磁的隙間を透過した電磁波ノイズを遮蔽するものである。   In the above configuration, the elastic film made of a rubber-like elastic material exhibits sealing properties against dust, water, and the like by being in close contact with the opposing surface of the conductive member, and the substrate is elastically deformed by the reaction force. In addition to providing the intimate force of the elastic film to the conductive member, it is made of a conductive metal and shields the transmission of electromagnetic noise. In addition, the outer shielding edge and the inner shielding edge are formed by a part of the substrate extending so as to cover an electromagnetic gap formed by an electrically insulating elastic film interposed between the conductive member and the substrate from the outside and the inside. The electromagnetic wave noise which tries to permeate | transmit a static gap or the electromagnetic wave noise which permeate | transmitted the said electromagnetic gap is shielded.

本発明に係る電磁波シールドガスケットによれば、電磁波ノイズの透過を遮蔽する基板の外縁部及び内縁部を互いに反対側へ屈曲して外側遮蔽縁及び内側遮蔽縁を形成した構成によって、ガスケットの幅の増大や圧縮反力の増大を来たすことなくシール性及び電磁波シールド性を奏することができる。   According to the electromagnetic shielding gasket according to the present invention, the outer edge and the inner edge of the substrate that shields transmission of electromagnetic noise are bent to the opposite sides to form the outer shielding edge and the inner shielding edge. Sealing properties and electromagnetic wave shielding properties can be achieved without increasing the compression reaction force.

本発明に係る電磁波シールドガスケットの好ましい実施の形態を示す装着状態の断面図である。It is sectional drawing of the mounting state which shows preferable embodiment of the electromagnetic wave shielding gasket which concerns on this invention. 本発明に係る電磁波シールドガスケットの好ましい他の実施の形態を示す装着状態の断面図である。It is sectional drawing of the mounting state which shows other preferable embodiment of the electromagnetic wave shielding gasket which concerns on this invention. 従来のガスケットの一例を示す装着状態の断面図である。It is sectional drawing of the mounting state which shows an example of the conventional gasket.

以下、本発明に係る電磁波シールドガスケットの好ましい実施の形態について、図1を参照しながら説明する。   Hereinafter, a preferred embodiment of the electromagnetic shielding gasket according to the present invention will be described with reference to FIG.

本実施例に係るガスケット1は、導電性を有する金属などからなり内部空間Sに不図示の電子機器などが収納された筐体などの第一導電性部材2と、導電性を有する金属などからなり前記第一導電性部材2の開口部を塞ぐように配置されて不図示の螺子などで結合される蓋体などの第二導電性部材3との間に介装されるものである。なお、第一導電性部材2は請求項1に記載された一方の導電性部材に相当するものであり、第二導電性部材3は請求項1に記載された他方の導電性部材に相当するものである。   The gasket 1 according to the present embodiment is made of a first conductive member 2 such as a casing made of a conductive metal or the like in which an electronic device (not shown) is housed in the internal space S, and a conductive metal or the like. It is arranged between the second conductive member 3 such as a lid which is arranged so as to close the opening of the first conductive member 2 and is connected by a screw or the like (not shown). The first conductive member 2 corresponds to one of the conductive members described in claim 1, and the second conductive member 3 corresponds to the other conductive member described in claim 1. Is.

そしてこのガスケット1は、弾性変形可能な導電性金属からなる基板11の両面に、ゴム状弾性材料(ゴム材料又はゴム状弾性を有する合成樹脂材料)からなる弾性膜12,13がコーティングされた構造を備え、すなわちメタル・ラバー複合材料からなるものであって、塑性加工(プレス成形)によって厚さ方向両側へ交互に突出形成された、連続した複数のシールビード1a〜1dを有する。このうち、最も内側のシールビード1aと、内側から3番目のシールビード1cは第一導電性部材2側へ凸の屈曲形状、内側から2番目のシールビード1bと最も外側(内側から4番目)のシールビード1dは第二導電性部材3側へ凸の屈曲形状に形成されている。   The gasket 1 has a structure in which elastic films 12 and 13 made of rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) are coated on both surfaces of a substrate 11 made of an electrically deformable conductive metal. In other words, it is made of a metal rubber composite material, and has a plurality of continuous seal beads 1a to 1d that are alternately protruded to both sides in the thickness direction by plastic working (press molding). Among these, the innermost seal bead 1a and the third seal bead 1c from the inner side are bent toward the first conductive member 2, and the second seal bead 1b from the innermost side is the outermost (fourth from the inner side). The seal bead 1d is formed in a bent shape that is convex toward the second conductive member 3 side.

また、基板11の内縁部11aは、第二導電性部材3側へ屈曲されてこの第二導電性部材3の内側面3aに沿って延びることにより、内側遮蔽縁1eとなっており、基板11の外縁部11bは、第一導電性部材2側へ屈曲されてこの第一導電性部材2の外側面2aに沿って延びることにより、外側遮蔽縁1fとなっている。すなわち、内側遮蔽縁1eと外側遮蔽縁1fの間の内法の幅寸法wは、第一導電性部材2及び第二導電性部材3の厚さ寸法tと同等もしくはそれより僅かに大きく、また、内側遮蔽縁1e及び外側遮蔽縁1fの高さは、第一導電性部材2と第二導電性部材3の間の隙間Gより高いものとなっている。   Further, the inner edge portion 11a of the substrate 11 is bent toward the second conductive member 3 side and extends along the inner side surface 3a of the second conductive member 3, thereby forming an inner shielding edge 1e. The outer edge portion 11b is bent toward the first conductive member 2 side and extends along the outer surface 2a of the first conductive member 2, thereby forming an outer shielding edge 1f. That is, the inner width w between the inner shielding edge 1e and the outer shielding edge 1f is equal to or slightly larger than the thickness t of the first conductive member 2 and the second conductive member 3, The heights of the inner shielding edge 1e and the outer shielding edge 1f are higher than the gap G between the first conductive member 2 and the second conductive member 3.

なお、この形態では、弾性膜12,13は内側遮蔽縁1e及び外側遮蔽縁1fを含む基板11の両面の全域に被着されている。   In this embodiment, the elastic films 12 and 13 are attached to the entire area of both surfaces of the substrate 11 including the inner shielding edge 1e and the outer shielding edge 1f.

以上のように構成された本発明の実施の形態のガスケット1は、第一導電性部材2と第二導電性部材3の対向面2b,3b間に介装されると共に、前記第一導電性部材2と第二導電性部材3を不図示の螺子を介して結合することによって、前記対向面2b,3b間で圧縮され、すなわちシールビード1a〜1dが適当に変形を受けた状態で、その反力によって、最も内側のシールビード1aと3番目のシールビード1cが、これを覆う一方の弾性膜12において第一導電性部材2の対向面2bに密接し、内側から2番目のシールビード1bと最も外側のシールビード1dが、これを覆う他方の弾性膜13において第二導電性部材3の対向面3bに密接し、これによって外部(図1における右側)からのダストや水等が、電子機器などが収納された内部空間Sに浸入するのを防止する高い密封性を奏するものである。   The gasket 1 of the embodiment of the present invention configured as described above is interposed between the opposing surfaces 2b and 3b of the first conductive member 2 and the second conductive member 3, and the first conductive member By joining the member 2 and the second conductive member 3 through a screw (not shown), the opposing surfaces 2b and 3b are compressed, that is, the seal beads 1a to 1d are appropriately deformed, Due to the reaction force, the innermost seal bead 1a and the third seal bead 1c are in close contact with the opposing surface 2b of the first conductive member 2 in one elastic film 12 covering this, and the second seal bead 1b from the inner side. The outermost seal bead 1d is in close contact with the facing surface 3b of the second conductive member 3 in the other elastic film 13 covering it, so that dust, water, etc. from the outside (right side in FIG. 1) Equipment is stored It was those to achieve the high sealing properties to prevent the intrusion into the internal space S.

導電性金属からなる基板11は、第一導電性部材2と第二導電性部材3の対向面2b,3b間で圧縮方向へ弾性変形を受けることによって、その反力で弾性膜12,13に第一導電性部材2及び第二導電性部材3に対する密接力を与えるものであると共に、内部空間Sに存在する電子機器で発生する電磁波ノイズEMIの透過を遮蔽するものである。   The substrate 11 made of a conductive metal is elastically deformed in the compression direction between the opposing surfaces 2b and 3b of the first conductive member 2 and the second conductive member 3, so that the reaction force causes the elastic films 12 and 13 to move. In addition to providing a close force to the first conductive member 2 and the second conductive member 3, the transmission of electromagnetic wave noise EMI generated in an electronic device existing in the internal space S is shielded.

そして内側遮蔽縁1eは、シールビード1b,1dにおいて第二導電性部材3と基板11の間に介在する弾性膜13による電磁的隙間を、その内側から覆う壁のように延びる基板11の内縁部11aによって、内部空間Sに存在する電子機器で発生して前記弾性膜13による電磁的隙間を透過しようとする電磁波ノイズEMIを、シールビード1bの内側で遮蔽し、周囲の電子回路などへの悪影響を抑制するものである。   The inner shielding edge 1e is an inner edge portion of the substrate 11 extending like a wall covering the electromagnetic gap due to the elastic film 13 interposed between the second conductive member 3 and the substrate 11 in the seal beads 1b and 1d. By 11a, electromagnetic noise EMI generated in the electronic device existing in the internal space S and trying to pass through the electromagnetic gap by the elastic film 13 is shielded inside the seal bead 1b and adversely affects the surrounding electronic circuits and the like. It suppresses.

また、内部空間Sに存在する電子機器で発生した電磁波ノイズEMIの一部は、シールビード1a,1cにおいて第一導電性部材2と基板11の間に介在する弾性膜12による電磁的隙間を透過するが、外側遮蔽縁1fは、この透過した電磁波ノイズΔEMIを、前記弾性膜12による電磁的隙間をその外側から覆う壁のように延びる基板11の外縁部11bによって遮蔽し、周囲の電子回路などへの悪影響を抑制するものである。   Further, part of the electromagnetic wave noise EMI generated in the electronic device existing in the internal space S is transmitted through the electromagnetic gap formed by the elastic film 12 interposed between the first conductive member 2 and the substrate 11 in the seal beads 1a and 1c. However, the outer shielding edge 1f shields the transmitted electromagnetic wave noise ΔEMI by the outer edge portion 11b of the substrate 11 extending like a wall covering the electromagnetic gap due to the elastic film 12 from the outside, and surrounding electronic circuits, etc. It suppresses adverse effects on

しかも、図1に示す実施の形態によれば、外側遮蔽縁1fは、下側(筐体である第一導電性部材2側)へ向けて屈曲された形状であるため、もし外側遮蔽縁1fと第一導電性部材2の外側面2aの間に隙間があっても、外部(図1における右側)からのダストや水等が外側遮蔽縁1fの内側にたまってしまうことはない。   In addition, according to the embodiment shown in FIG. 1, the outer shielding edge 1 f is bent toward the lower side (the first conductive member 2 side which is the casing). Even if there is a gap between the outer surface 2a of the first conductive member 2, dust, water, etc. from the outside (right side in FIG. 1) will not accumulate inside the outer shielding edge 1f.

なお、シールビード1a〜1dの断面形状は、図1に示す形状以外にも種々の変更が可能であり、本発明はシールビード1a〜1dが形成されていないものにも適用することができる。   In addition, the cross-sectional shape of the seal beads 1a to 1d can be variously changed in addition to the shape shown in FIG. 1, and the present invention can also be applied to those in which the seal beads 1a to 1d are not formed.

また、図1に示す実施の形態によれば、内側遮蔽縁1e及び外側遮蔽縁1fの両面は弾性膜12,13で覆われているが、図2に示す他の実施の形態のように、内側遮蔽縁1e及び外側遮蔽縁1fでは導電性を有する基板11の内縁部11a及び外縁部11bを弾性膜12,13から露出させ、板ばね状にして第二導電性部材3の内側面3a及び第一導電性部材2の外側面2aと弾性的に金属接触可能な構成とすることによって、基板11を第一導電性部材2及び第二導電性部材3と電気的に導通させれば、電磁波ノイズEMI,ΔEMIが基板11の内縁部11a及び外縁部11b(内側遮蔽縁1e及び外側遮蔽縁1f)を回折するのを防止して、電磁波シールド機能を一層高めることができる。   Further, according to the embodiment shown in FIG. 1, both sides of the inner shielding edge 1e and the outer shielding edge 1f are covered with the elastic films 12 and 13, but like the other embodiments shown in FIG. At the inner shielding edge 1e and the outer shielding edge 1f, the inner edge portion 11a and the outer edge portion 11b of the conductive substrate 11 are exposed from the elastic films 12 and 13, and are formed into a leaf spring shape to form the inner side surface 3a of the second conductive member 3 and If the substrate 11 is electrically connected to the first conductive member 2 and the second conductive member 3 by adopting a configuration in which the outer surface 2a of the first conductive member 2 can be elastically brought into metal contact, an electromagnetic wave can be obtained. Noise EMI, ΔEMI can be prevented from diffracting the inner edge portion 11a and the outer edge portion 11b (the inner shielding edge 1e and the outer shielding edge 1f) of the substrate 11, and the electromagnetic wave shielding function can be further enhanced.

1 ガスケット
11 基板
11a 内縁部
11b 外縁部
12,13 弾性膜
1a〜1d シールビード
1e 内側遮蔽縁
1f 外側遮蔽縁
2 第一導電性部材(一方の導電性部材)
2a 外側面
3 第二導電性部材(他方の導電性部材)
3a 内側面
DESCRIPTION OF SYMBOLS 1 Gasket 11 Board | substrate 11a Inner edge part 11b Outer edge part 12, 13 Elastic film 1a-1d Seal bead 1e Inner shielding edge 1f Outer shielding edge 2 1st electroconductive member (one electroconductive member)
2a Outer surface 3 Second conductive member (the other conductive member)
3a inner surface

Claims (1)

一対の導電性部材間に介在されるガスケットであって、導電性金属からなる基板の厚さ方向両面に、それぞれゴム状弾性材料からなり前記導電性部材の対向面と密接可能な弾性膜が被着された構造を備え、前記基板の外縁部が一方の導電性部材側へ屈曲されてこの一方の導電性部材の外側面に沿って延びる外側遮蔽縁と、前記基板の内縁部が他方の導電性部材側へ屈曲されてこの他方の導電性部材の内側面に沿って延びる内側遮蔽縁を有することを特徴とする電磁波シールドガスケット。   A gasket interposed between a pair of conductive members, and an elastic film made of a rubber-like elastic material, which can be in close contact with the opposing surface of the conductive member, on both sides in the thickness direction of the substrate made of a conductive metal. The outer edge of the substrate is bent toward one conductive member and extends along the outer surface of the one conductive member, and the inner edge of the substrate is the other conductive member. An electromagnetic wave shielding gasket having an inner shielding edge that is bent toward the conductive member side and extends along the inner side surface of the other conductive member.
JP2011151643A 2011-07-08 2011-07-08 Electromagnetic shielding gasket Active JP5708931B2 (en)

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